There are still many problems ______ before we are ready for a long stay on the Moon. A．solv..

Question

There are still many problems ______ before we are ready for a long stay on the Moon. A．solving B．solved C．being solved D．to be solved

Answer 1

D

试题分析：本题考查非谓语动词，考查方式为非谓语动词形式选择。根据题干信息，非谓语动词在这里做定语，限定“要去解决的问题”。根据非谓语动词做定语的规则，现在分词表示主动和正在发生，过去分词表示被动或完成，而不定式表示将要发生，所以选D。